Ruined Fast DL Speed?

I just went through the process of Portfowarding, and here’s what happened.

My DLs were going very slow, (16 kb/s if lucky.) and I went to the portforward site. I got a static IP adress, and as soon as I configured that, my speed cranked to 40 or so, and kept raising. Then I set up portforwarding, which just lost my connection. So I took that off, but now my DL speed is really slow again. I even went through getting a Static IP again. Anyone know why my speed went down again, even though I’m still using the same static IP? And how do I fix this?

Oh, and i’m using 7.0.

I should add that the port forwarding only lost my connections to the Downloads, my internet worked fine. (?)